Reishin:
Zen Cancer Wisdom by Daju Suzanne Friedman
Awareness by Anthony deMello
Everyday Zen by Charlotte Joko Beck
Being with Dying: Cultivating Compassion and Fearlessness in the Presence of Death by Joan Halifax, Roshi

Vimala:
Essays in Zen Buddhism by D.T. Suzuki
How the Swans Came to the Lake by Rick Fields
What the Buddha Taught by Walpola Rahula
Zen Mind, Beginners Mind by Shunryu Suzuki

Taiso:
The Story of Chinese Zen by Nan Huai-Chin translated by Thomas Cleary
The Hoofprint of the Ox by Master Sheng Yen
Zen's Chinese Heritage by Andy Ferguson
Shobogenzo by Dogen (either the translation by Nishijima and Cross - in 4 vols, or Kazuaki Tanahashi - in 2 vols)

Doyo:
How to Raise an Ox by Francis Dojun Cook.
The Platform Sutra: The Zen Teaching of Huineng by Red Pine.
The Path of Bodhidaharma: The Teachings of Shodo Harada by Priscilla Daichi Storandt
Unlocking the Zen Koan: A New Translation of the Zen Classic Wumenguam by Thomas Cleary